Summit Ice Melt Systems
PO Box 6928, Tahoe City, CA 96145
Ph 530-583-8888
summiticemelt.com
Multi-Circuit Ambient Temp Sensing Digital Controllers
Operation
The Multi-Circuit Controller uses a thermistor to sense ambient temperatures. When the
temperature drops below the Heater-On set-point, the system is energized. When the
temperature rises above the Heater-On set-point, the system is de-energized.
I the temperature drops below the low-temp cuto , the system is de-energized. When
the temperature rises above the low-temp cuto , the system is energized.
The 3-position rocker switch allows the operator to set the system in Automatic,
Manual, or O mode (center position). When the rocker switch is set to the MANUAL
position, heaters are energized, regardless o ambient conditions.
Installation
The Multi-Circuit Controller enclosures vary in size to accommodate the number o
circuits controlled. The enclosures are NEMA 4/12 rating so they may be mounted
indoors or outdoors, typically near the circuit breaker panel. Each branch circuit must be
protected by a ground ault protection device per the NEC. A 120Vac protected circuit is
required to energize the controller.
The ambient sensor is mounted outdoors in a shaded location representative o
minimum ambient conditions (typically on the north side o a building), and away rom
any heat source, such as direct sunlight or a utility room exhaust vent, so that the
temperature sensor gives an accurate reading o the air temperature re lective o actual
ambient conditions. The ambient sensor comes with a standard 10 t lead, but its range
can be extended up to hundreds o eet using ordinary stranded copper wire. See
schematic diagram or details.
Pre-Season Testing
The heater circuits may be energized and tested or proper unctionality prior to the cold
weather season by simply setting the 3-position rocker switch to Manual. Amperage
readings may then be taken on each branch circuit. Amperage will depend on ambient
temperature and time. Follow heater manu acturer test procedures.
